Passing out while driving

I'm not really sure what's going on with me. I've read a number of other posts on the same subject, but they describe symptoms I don't suffer from.
While driving I often get a strange feeling in my head. I'm not sure how to describe it. It's like a weird numbness of my brain, like it's trying to shut down on me. Sometimes I feel a weird twinge/tingling. Anyways, when this happens it is almost always accompanied by difficulty staying awake. I feel as if I'm losing consciousness and it takes a concerted effort to remain awake to continue driving. This happens whether I'm well rested or not. Whether I'm stressed about a bill, or happy that everything is payed up to date. Sometimes after an episode like that I get a mild heaviness in my head, typically located in the right front of my head but sometimes in the rear left. I have had EEGs, EKGs, MRIs, and blood tests. All have come up negative. I'm at a loss.

I'm not really sure what's going on with me. I've read a number of other posts on the same subject, but they describe symptoms I don't suffer from.
While driving I often get a strange feeling in my head. I'm not sure how to describe it. It's like a weird numbness of my brain, like it's trying to shut down on me. Sometimes I feel a weird twinge/tingling. Anyways, when this happens it is almost always accompanied by difficulty staying awake. I feel as if I'm losing consciousness and it takes a concerted effort to remain awake to continue driving. This happens whether I'm well rested or not. Whether I'm stressed about a bill, or happy that everything is payed up to date. Sometimes after an episode like that I get a mild heaviness in my head, typically located in the right front of my head but sometimes in the rear left. I have had EEGs, EKGs, MRIs, and blood tests. All have come up negative. I'm at a loss.

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